Narada Purana (Jyotisha Selections) · by Vyasa
Chapter 6 · Calendar, Muhurta Elements
कालमानं मुहूर्ताङ्गानि च
चन्द्रयुक्तेषु भेष्वेषु शुभकर्म न कारयेत् ।सूर्यभात्सर्वपित्र्यर्क्षं त्वाष्ट्रमित्राप्तभेषु च ॥ २३३ ॥
In the full Narada Purana (Purva Bhaga) this is chapter 56, verse 233.
When the Moon is in these stars, do not have a good act done. From the Sun's star, count to Ashlesha and Magha, and to Chitra, Anuradha and Purva Ashadha...
Simple meaning: No good act when the Moon is in these omen stars. A count from the Sun's star begins.
सविष्णुभेषु क्रमशो हस्तभाच्चंद्रसंयुतः ।
Count from the Sun's star to certain stars. The same count from Hasta gives a bad Moon star.
चंडीशचंडायुधाख्यस्तस्मिन्नैवाचरेच्छुभम् ।
This bad combination is called Chandisha-Chandayudha. Do no good act in it.
क्रकचो नाम योगोऽयं मंगलेष्वतिगर्हितः ।
Tithi plus weekday making 13 is Krakacha, very bad. Sunday on the 7th or Wednesday on the 1st opens another.